WO2001084270B1 - Method and system for intrusion detection in a computer network - Google Patents

Method and system for intrusion detection in a computer network

Info

Publication number
WO2001084270B1
WO2001084270B1 PCT/US2001/013227 US0113227W WO0184270B1 WO 2001084270 B1 WO2001084270 B1 WO 2001084270B1 US 0113227 W US0113227 W US 0113227W WO 0184270 B1 WO0184270 B1 WO 0184270B1
Authority
WO
WIPO (PCT)
Prior art keywords
network
intrusion event
vulnerability
computer
detected
Prior art date
Application number
PCT/US2001/013227
Other languages
French (fr)
Other versions
WO2001084270A2 (en
WO2001084270A3 (en
Inventor
Peter H Kennis
Original Assignee
Internet Security Systems Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Internet Security Systems Inc filed Critical Internet Security Systems Inc
Priority to AU2001255641A priority Critical patent/AU2001255641A1/en
Publication of WO2001084270A2 publication Critical patent/WO2001084270A2/en
Publication of WO2001084270A3 publication Critical patent/WO2001084270A3/en
Publication of WO2001084270B1 publication Critical patent/WO2001084270B1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/14—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic
    • H04L63/1408—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic by monitoring network traffic
    • H04L63/1416—Event detection, e.g. attack signature detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/14—Network architectures or network communication protocols for network security for detecting or protecting against malicious traffic
    • H04L63/1433—Vulnerability analysis

Abstract

An intrusion detection system for detecting intrusion events in a computer network and assessing the vulnerability of the network components to the detected events. The intrusion detection system comprises a scanner, one or more sensors and a security console for operation within a networked computing environment. A sensor of the inventive intrusion detection system can monitor the networked computing environment for possible intrusion events representing an unauthorized access or use of the network resources. In response to detecting an intrusion event, the sensor can generate a scan request for handling by a scanner. This request initiates a scan of the target computer by the scanner to determine the vulnerability of the target to the attack. Based on this vulnerability analysis, the inventive intrusion detection system can evaluate the severity of the detected intrusion event and issue an alert having a priority corresponding to the severity of the intrusion.

Claims

AMENDED CLAIMS[received by the International Bureau on 1 April 2002 (01.04.02); original claim 2 amended; new claims 4-40 added; remaining claims unchanged (10 pages)]
1. A computer-implemented process for generating an advisory about an intrusion event in a computer network, comprising the steps of: monitoring data packets carried by the computer network for a possible intrusion event; detecting an intrusion event; determining whether the detected intrusion event represents a qualified intrusion event having a known characteristic associated with a recognized attack and a detectable target vulnerability; if the detected intrusion event is a qualified intrusion event, then identifying a network target and evaluating whether the network target is vulnerable to the detected intrusion event; and assigning the detected intrusion event with a ranking based on the vulnerability of the network target; issuing the advisory having the assigned ranking.
19
2. (Once Amended) A network security system for generating an advisory about an intrusion event in a computer network, comprising the steps of: a sensor, coupled to the computer network, for monitoring data packets carried by the computer network for a possible intrusion event, the sensor further operative to issue a scan request in response to determining that a detected intrusion event represents a qualified intrusion event having a known characteristic associated with a recognized attack and a detectable target vulnerability; a scanner, coupled to the computer network and the sensor, for scanning the computer network, the scanner responsive to the scan request issued by the sensor to identify a network target and to evaluate whether the network target is vulnerable to the detected intrusion event, the scanner further operative to issue the advisory having a ranking based on the vulnerability of the network target; a security console, coupled to the sensor and to the scanner, for presenting the advisory, wherein the ranking for the advisory defines the action to be taken in response to presentation of the advisory.
20
3. A computer-implemented method for creating a security policy for a computer network system, comprising the steps:
(a) scanning a selected segment of the computer network;
(b) responsive to the scan of the selected network segment, identifying a current configuration of network components and services for the selected network segment;
(c) creating the security policy by activating predetermined exploits associated with the current configuration of network components and service; and
(d) repeating steps (a) - (c) at time intervals, thereby matching at least one action taken in response to detection of an intrusion event to the vulnerability of the current configuration of network components and services to the intrusion event.
21
4. (New) An integrated intrusion detection and vulnerability assessment system for automatically responding to detection of intrusion events in a computer network comprising network resources, comprising a plurality of sensors, each operative to monitor at least a portion of the computer network for possible intrusion events representing an unauthorized access of the network resources and to generate an intrusion detection signal in response to detection of one of the possible intrusion events; and a scanner, functionally coupled to each of the sensors, responsive to the intrusion detection signal output by any one of the sensors to initiate a scan of the portion of the computer network associated with the sensor, the scan useful for assessing the vulnerability of the network resources to the detected possible intrusion event, the scanner further operative to issue an alert signal as an advisory about the vulnerability of the network resources to the detected possible intrusion event in response to completing the scan of the portion of the computer network.
5. (New) The system of Claim 4 further comprising a console, functionally coupled to the scanner, for presenting the alert signal in a format useful for transferring to an user information about the vulnerability of the network resources to the detected possible intrusion event.
6. (New) The system of Claim 4, wherein the alert signal comprises a priority ranking representing the vulnerability of the network resources to the detected possible intrusion event.
7. (New) The system of Claim 4 wherein the scanner is operative to generate the alert signal having a priority ranking associated with a low priority attack event if the scanner fails to identify a vulnerability of the network resources for the scanned portion of the computer network to the detected possible intrusion event.
8. (New) The system of Claim 4, wherein the scanner is operative to generate the alert signal having a priority ranking associated with a high priority attack event if the scanner identifies a vulnerability of the network resources for the scanned portion to the detected possible intrusion event.
22
9. (New) The system of Claim 4, wherein each sensor can output the detected intrusion event signal in response to determining whether the detected possible intrusion event represents a qualified intrusion event having a known characteristic associated with a recognized computer attack and a detectable target vulnerability.
10. (New) The system of Claim 4, wherein the scanner determines the vulnerability of the network resources for the scanned portion of the computer network to the detected possible intrusion event based upon the scan completed by the scanner.
11. (New) The system of Claim 4, wherein the scanner is further operative to issue a command to configure a security policy for the sensor associated with the scanned portion of the computer network in response to completing an assessment of the vulnerability of the network resources for the scanned portion of the computer network to the detected possible intrusion event.
23
12. (New) A computer-implemented process for generating an advisory about an intrusion event of a computer network comprising a plurality of network resources, comprising the steps of: detecting the intrusion event by evaluating packets carried by the computer network; determining whether the detected intrusion event represents a qualified intrusion event having a known characteristic associated with a recognized attack; if the detected intrusion event is a qualified intrusion event, then identifying one of the network resources as a target of the attack and conducting a scan of the network resource to assess whether the scanned network resource is vulnerable to the detected intrusion event; and issuing the advisory comprising information about the potential vulnerability of the scanned network resource to the detected intrusion event.
13. (New) The computer-implemented process of Claim 12 further comprising the step of issuing a command to configure exploits for a sensor associated with the scanned network resource in response to completing an assessment of the vulnerability of the network resource to the detected intrusion event, thereby configuring a security policy for the sensor without manual intervention.
14. (New) The computer-implemented process of Claim 12, wherein the advisory comprises a priority ranking representing the potential vulnerability of the scanned network resource to the detected intrusion event.
15. (New) The computer-implemented process of Claim 14, wherein the advisory comprises the priority ranking associated with a low priority attack event if the scan fails to identify a vulnerability of the scanned network resource to the detected intrusion event.
16. (New) The computer-implemented process of Claim 15, where the advisory comprises the priority ranking associated with a high priority attack event if the scan identifies a vulnerability of the scanned network resource to the detected possible intrusion event.
24
17. (New) A network security system for generating an advisory about an intrusion event in a computer network comprising network resources, comprising the steps of: a sensor, coupled to the computer network, for monitoring data packets carried by the computer network for a possible intrusion event, the sensor further operative to issue a scan request in response to determining that a detected intrusion event represents a qualified intrusion event having a known characteristic associated with a recognized attack; a scanner, functionally coupled to the computer network and the sensor, operative to automatically complete a scan focused on at least one of the network resources that is the subject of the attack in response to receiving the scan request issued by the sensor, the scanner further operative to output the advisory comprising information about the vulnerability of each scanned network resource; and a security console, functionally coupled to the scanner, for presenting the information of the advisory in a format useful identifying the action to be taken in response to presentation of the advisory, whereby the advisory presented by the security console represents a correlation of information about the detected intrusion event and the corresponding vulnerability of each scanned network resource.
18. (New) The system of Claim 17, wherein the advisory comprises a priority ranking representing the vulnerability of the network resources to the detected possible intrusion event.
19. (New) The system of Claim 17 wherein the scanner is operative to generate the advisory having a priority ranking associated with a low priority attack event if the scanner fails to identify a vulnerability of the network resources for the scanned portion of the computer network to the detected possible intrusion event.
20. (New) The system of Claim 17 wherein the scanner is operative to generate the advisory having a priority ranking associated with a high priority attack event if the scanner identifies a vulnerability of the network resources for the scanned portion to the detected possible intrusion event.
25
21. (New) A computer-implemented process for generating an advisory about an intrusion event of a computer network comprising a plurality of network resources, comprising the steps of: issuing a scan request in response to determining that a detected intrusion event represents a qualified intrusion event having a known characteristic associated with a recognized attack; responsive to the scan request, completing a scan focused on at least one of the network resources that is the subject of the attack to assess the vulnerability of each scanned network resource to the attack, generating the advisory comprising information representing a correlation of information about the detected intrusion event and the corresponding vulnerability of each scanned network resource.
22. (New) The computer-implemented process of Claim 21 wherein the step of generating the advisory comprises issuing the advisory having a priority ranking associated with a low priority attack event if the scan fails to identify a vulnerability of the scanned network resource to the detected possible intrusion event.
23. (New) The computer-implemented process of Claim 21, wherein the step of generating the advisory comprises issuing the advisory having a priority ranking associated with a high priority attack event if the scan identifies a vulnerability of the scanned network resource to the detected possible intrusion event.
26
24. (New) A scanner for a computer network comprising network resources, the scanner comprising: means responsive to detection of an intrusion event representing a possible attack of at least one of the network resources for automatically completing a scan for at least one of the network resources that is the subject of the attack to assess the vulnerability of each scanned network resource; and means for generating the advisory comprising information representing a correlation of information about the detected intrusion event and the corresponding vulnerability of each scanned network resource.
25. (New) The scanner of Claim 24, wherein the scanner is functionally coupled to a sensor operable to monitor the computer network for a possible intrusion event, the sensor further operative to issue a scan request in response to determining that a detected intrusion event represents a qualified intrusion event having a known characteristic associated with a recognized attack and a detectable target vulnerability.
26. (New) The scanner of Claim 24, wherein the scanner is functionally coupled to a security console for presenting the information of the advisory to a user.
27
27. (New) A computer-implemented process for automatically configuring a security policy for a computer network, comprising the steps: scanning a selected segment of the computer network having a first security policy to identify the present network configuration of network components and services for the selected segment; responsive to the scan of the selected network segment, determining whether the present network configuration for the selected segment is different from a prior network configuration of network components and services for the selected segment; and in the event that the present network configuration for the selected segment is different from the prior network configuration for the selected segment, then configuring a second security policy for the selected segment based upon the present network configuration, the second security policy being different from the first security policy.
28. (New) The computer-implemented process of Claim 27, wherein the step of configuring the second security policy for the selected segment comprises activating exploits for a sensor associated with the selected segment of the computer network based on the present network configuration.
29. (New) The computer-implemented process of Claim 27 further comprising generating an output file comprising the second security policy and forwarding the output file to a sensor associated with the selected segment of the computer network.
30. (New) The computer-implemented process of Claim 29 further comprising sending the output file to a security console in support of an application of the second security policy to the sensor.
28
PCT/US2001/013227 2000-04-28 2001-04-25 Method and system for intrusion detection in a computer network WO2001084270A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001255641A AU2001255641A1 (en) 2000-04-28 2001-04-25 Method and system for intrusion detection in a computer network

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/561,588 US7574740B1 (en) 2000-04-28 2000-04-28 Method and system for intrusion detection in a computer network
US09/561,588 2000-04-28

Publications (3)

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WO2001084270A2 WO2001084270A2 (en) 2001-11-08
WO2001084270A3 WO2001084270A3 (en) 2002-06-27
WO2001084270B1 true WO2001084270B1 (en) 2002-07-25

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US (2) US7574740B1 (en)
AU (1) AU2001255641A1 (en)
WO (1) WO2001084270A2 (en)

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